Difference between revisions of "IOP16 Register File"

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(Created page with "* Instruction encodes 4-bits for the register number * 8 General Purpose (GP) Registers ** Registers numbered 0x0-0x7 * Special Purpose Registers hard-coded values ** Register...")
 
 
(11 intermediate revisions by the same user not shown)
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= Register File =
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<video type="youtube">qPvwggaQ4w0</video>
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* Instruction encodes 4-bits for the register number
 
* Instruction encodes 4-bits for the register number
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* 8 General Purpose (GP) Registers
 
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** Registers numbered 0x0-0x7
 
 
* Special Purpose Registers hard-coded values
 
* Special Purpose Registers hard-coded values
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** Register 0x8 has value 0x00
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** Register 0x8 has constant value 0x00
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** Register 0x9 has value 0x01
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** Register 0x9 has constant value 0x01
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** Register 0xF has value 0xFF
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** Register 0xF has constant value 0xFF
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* 4, 8, or 13 General Purpose (GP) Registers
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** Registers numbered 0x0-0x7, 0x0A-0xE
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== Configuring Number of Registers ==
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* The number of GP registers can be configured
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** 4 = 4 GP registers plus 0x08, 0x09 0x0F constants
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** 8 = 8 GP registers plus 0x08, 0x09 0x0F constants
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** 16 = 13 GP registers including 0x08, 0x09 0x0F constants
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* Register count configured by NUM_REGS value in cpu_001.vhd
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<pre>
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RegFile : ENTITY work.RegisterFile
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GENERIC map (
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NUM_REGS => 4 -- 4, 8. or 16
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)
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</pre>
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= Resources =
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* 4 registers
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** 19 ALMs
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** 32 registers
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* 8 registers
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** 34 ALMs
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** 64 registers
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* 16 registers (13 are GP)
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** 42 ALMs
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** 104 registers

Latest revision as of 14:11, 19 April 2022

Register File

  • Instruction encodes 4-bits for the register number
  • Special Purpose Registers hard-coded values
    • Register 0x8 has constant value 0x00
    • Register 0x9 has constant value 0x01
    • Register 0xF has constant value 0xFF
  • 4, 8, or 13 General Purpose (GP) Registers
    • Registers numbered 0x0-0x7, 0x0A-0xE

Configuring Number of Registers

  • The number of GP registers can be configured
    • 4 = 4 GP registers plus 0x08, 0x09 0x0F constants
    • 8 = 8 GP registers plus 0x08, 0x09 0x0F constants
    • 16 = 13 GP registers including 0x08, 0x09 0x0F constants
  • Register count configured by NUM_REGS value in cpu_001.vhd
RegFile : ENTITY work.RegisterFile
GENERIC map (
	NUM_REGS => 4	-- 4, 8. or 16
)

Resources

  • 4 registers
    • 19 ALMs
    • 32 registers
  • 8 registers
    • 34 ALMs
    • 64 registers
  • 16 registers (13 are GP)
    • 42 ALMs
    • 104 registers
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